/*
 moxl - Modular XML Library
 Copyright (c) 2007, Malcolm Sparks

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package moxl.xpath.parser.types;

import moxl.xpath.XPathContext;
import moxl.xpath.parser.Operand;

public class XPathLiteralOperand implements Operand
{
	private String valueString;
	private AbstractXPathValue value;

	public XPathLiteralOperand(String image)
	{
		if ((image.startsWith("\"") && image.endsWith("\"")) || (image.startsWith("'") && image.endsWith("'")))
		{
			valueString = image.substring(1, image.length() - 1);
		}
		else
		{
			throw new IllegalArgumentException("Literal must be properly quoted.");
		}
		value = new XPathStringValue(valueString);
	}

	public String getValueString()
	{
		return valueString;
	}

	public AbstractXPathValue evaluate(XPathContext ctx)
	{
		return value;
	}
}
